双级轴向涡流器文氏管长度对流场和喷雾特性影响

为了研究双级轴向涡流器文氏管长度对流场和喷雾特性的影响,通过数值计算和试验分别研究了4种文氏管长度的双级轴向涡流器方案的下游流场和匹配喷嘴的雾化特性。结果表明:随着文氏管无量纲长度由0.23增加至0.49,一级涡流器流量系数由0.98降至0.7,二级涡流器的流量系数保持0.75不变,涡流器出口旋流数由0.08增至0.48,旋流扩张角由闭合状态增至约90°,涡流器下游流场由反转回流区变为传统回流区。文氏管长度最短的方案的索太尔平均直径(SMD)和喷雾锥角受涡流器压降的影响较小,而其他方案的SMD和喷雾锥角受涡流器压降影响较大,且在相同涡流器压降和油压下,SMD和喷雾锥角随着文氏管长度增加而增大。 

Effect of Venturi length on flow field and spray characterization of dual axial swirler

In order to investigate the effect of dual axial swirler Venturi length on flow field and spray characteristics, the flow field downstream the dual axial swirler outlet for four different Venturi length dual axial swirlers was simulated and matched with fuel nozzle to test the spray characterization. The results showed that the 2ed swirler’s discharge coefficient was 0.75 constantly, while the 1st swirler’s discharge coefficient decreased from 0.98 to 0.7, the swirler outlet swirl number increased from 0.08 to 0.48, and the downstream flow field from inside-out recirculation zone turned into conventional recirculation zone as the dimensionless length of Venturi increased from 0.23 to 0.49. Spray cone angle and Sauter mean diameter (SMD) of shortness Venturi length case were less affected by air pressure drop across from swirler, however, the other cases’ spray cone angle and SMD were strongly affected by air pressure drop across from swirler, and SMD and spray cone angle increased as Venturi length increased under the same fuel mass flow rate and air pressure drop.